TW201946867A - 用於光伏打吸收膜之核殼奈米顆粒 - Google Patents

用於光伏打吸收膜之核殼奈米顆粒 Download PDF

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TW201946867A
TW201946867A TW108134897A TW108134897A TW201946867A TW 201946867 A TW201946867 A TW 201946867A TW 108134897 A TW108134897 A TW 108134897A TW 108134897 A TW108134897 A TW 108134897A TW 201946867 A TW201946867 A TW 201946867A
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克里斯多福 紐曼
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Abstract

本發明係關於一種製造CIGS型核殼奈米顆粒之方法，該方法製造可包含四元或三元金屬硫族化物核的核殼奈米顆粒。該核可大體上被二元金屬硫族化物殼包圍。核殼奈米顆粒可經溶液相沉積(solution-phase deposition)而沉積於PV電池接觸(例如鉬電極)上。然後可使該等沉積顆粒熔化或熔融成吸收薄膜以用於光伏打裝置。

Description

用於光伏打吸收膜之核殼奈米顆粒
1.技術領域
本發明通常係關於半導體奈米顆粒。更特定言之，其係關於製造用於基於銅銦鎵二硒化物/二硫化物-(CIGS)之薄膜光伏打裝置中之核殼奈米顆粒的方法。
2.相關技術之包含於37 CFR 1.97及1.98下所揭示之資訊之描述
為獲得廣泛接受性，光伏打電池(「PV電池」，亦稱為太陽能電池或PV裝置)通常需要以可與使用化石燃料發電成本競爭的成本發電。太陽能電池較佳應具有低材料及製造成本且具有增加之光電轉換效率。因為在薄(~2-4 μm)活性層內之材料的量小，所以本質上薄膜具有低材料成本。因此，對開發高效薄膜太陽能電池已作出相當大之努力。在各種研究之薄膜材料中，基於黃銅礦之裝置(Cu(In及/或Ga)(Se及視情況係S)2 ，本文統稱為「CIGS」)已顯示巨大前景且已受到大量關注。因為CuInS2 (1.5 eV)及CuInSe2 (1.1 eV)之能帶隙可很好地與太陽光譜相匹配，所以基於CIGS材料之光伏打裝置係有效。
雖然CIGS材料廉價，但是用於CIGS薄膜的習知製造方法涉及昂貴的氣相或蒸發技術。一種降低成本之解決方案係藉由使用溶液相沉積技術將CIGS組分之顆粒沉積在基板上及然後使該等顆粒熔化或熔融成薄膜以形成薄膜。理想地，奈米顆粒聚結以形成大顆粒薄膜。可使用金屬組分之氧化物顆粒來完成溶液相沉積，接著與H2 進行還原反應及與含硒氣體(例如，H2 Se)進行反應性燒結。或者，可使用預製之CIGS顆粒完成溶液相沉積。
CIGS型顆粒(即，CIGS或相似材料)較佳具有某些允許其等形成大顆粒薄膜之性質。例如，奈米顆粒較佳係較小且具有不同於相同材料之較大顆粒的物理、電子及光學性質。此種較小顆粒通常擠壓更緊密，從而在熔化時促進顆粒之聚結。另外，奈米顆粒較佳具有窄尺寸分佈。因為奈米顆粒熔點與顆粒尺寸直接相關，所以窄尺寸分佈促進均勻之熔化溫度。均勻熔化會產生均勻且高質量的(優良電性)膜。
雖然CIGS之溶液相沉積係製造薄膜之廉價解決方案，但其仍有缺點。例如，薄膜通常係在背側PV電池接觸(例如鉬電極)上生長。在顆粒生長期間，鎵顆粒傾向於向膜一側遷移，從而導致不均勻之鎵分佈。因此，最終之薄膜可具有向背側PV電池接觸增大及向膜頂部減小之鎵濃度梯度。在膜頂部附近之鎵濃度不足會降低通過能帶隙擴展獲得所需電壓之能力。該技術之另一個問題係與銅濃度有關。富銅環境為顆粒生長提供最佳條件，同時富In+Ga環境導致最佳電子性能。解決此困境之一個方案係用富銅材料生長大顆粒及然後藉由以KCN溶液蝕刻膜來移除不需要之銅副產物。但是，此蝕刻技術在移除不需要之銅時既耗時亦低效。此外，KCN係一種劇毒化合物。另一個缺點係為出眾之顆粒生長而需要硒化沉積之奈米顆粒以獲得足夠的體積膨脹。可藉由使相對較小(離子半徑)之硫化物與較大之硒化物反應(例如，使硫化物與硒氣反應)實現體積膨脹。此方法苛刻且昂貴，且其可導致無意間硒化PV電池接觸，從而妨礙其電子性能。
因此，在此項技術中需要改進CIGS奈米顆粒之溶液相沉積。更特定言之，在此項技術中需要製造將會生長大顆粒並形成富In+Ga的薄膜之CIGS奈米顆粒。在此項技術中亦需要將在顆粒生長期間防止鎵遷移且不需要苛刻的硒化製程以達成體積膨脹之CIGS奈米顆粒。
本發明大體上係關於CIGS型核殼奈米顆粒之製造。在一實施例中，該等核殼奈米顆粒包含四元或三元金屬硫族化物核。在另一實施例中，該核可大體上被二元金屬硫族化物殼包圍。在又一實施例中，核殼奈米顆粒可經由溶液相沉積而沉積在PV電池接觸(例如鉬電極)上。隨後可使該等沉積顆粒熔化或熔融成吸收薄膜。
相關申請案之交叉參考
本申請案主張2013年12月6日申請之美國臨時申請案第61/912,916號之權利。
對聯邦政府資助之研究或發展的申明：不適用
在詳細說明至少一個實施例前，應瞭解本文闡述之發明概念不將其等應用侷限在下述說明中所闡述或在圖式中所闡明之結構細節或元件配置。亦應瞭解本文所用之措辭與術語僅用於敘述之目的且不應認為限制。
應進一步瞭解所描述之特徵中之任意一者可各別使用或與其他特徵組合使用。熟習此項技術者在檢視文中圖式及詳細說明後將或可瞭解其他發明之調配物、方法、特徵及優點。意欲所有該等其他調配物、方法、特徵及優點受隨附申請專利範圍保護。
本申請案中所引述之所有參考文獻之全文以引用的方式併入本申請案中。
如本文所使用，「CIGS」、「CIS」及「CIGS型」可交換使用且各指由式AB1-x B'x C2-y C'y 表示之材料，其中A係Cu、Zn、Ag或Cd；B及B'獨立地係Al、In或Ga；C及C'獨立地係S、Se或Te；0≤x≤1；及0≤y≤2。實例材料包含CuInSe2 、CuInx Ga1-x Se2 、CuGaSe2 、ZnInSe2 、ZnInx Ga1-x Se2 、ZnGaSe2 、AgInSe2 、AgInx Ga1-x Se2 、AgGaSe2 、CuInSe2-y Sy 、CuInx Ga1-x Se2-y Sy 、CuGaSe2-y Sy 、ZnInSe2-y Sy 、ZnInx Ga1-x Se2-y Sy 、ZnGaSe2-y Sy 、AgInSe2-y Sy 、AgInx Ga1-x Se2-y Sy 及AgGaSe2-y Sy ，其中0≤x≤1；及0≤y≤2。
本發明大體上係關於CIGS型核殼奈米顆粒之製造。在一個實施例中，該等核殼奈米顆粒包含四元或三元金屬硫族化物核。在另一實施例中，該核可大體上被二元金屬硫族化物殼包圍。在又一實施例中，核殼奈米顆粒可經由溶液相沉積而沉積在PV電池接觸(例如鉬電極)上。隨後可使該等沉積顆粒熔化或熔融成吸收薄膜。
圖1(僅藉由實例之方式)顯示核殼奈米顆粒101之實施例的橫截面。該核殼奈米顆粒包含核102。核102可包含具有式AB1-x B'x C2-y C'y 之任何金屬硫族化物，其中A係Cu、Zn、Ag或Cd；B及B'獨立地係Al、In或Ga；C及C'獨立地係S、Se或Te；0≤x≤1；及0≤y≤2。在一實施例中，奈米顆粒核102可係四元金屬硫族化物。四元金屬硫族化物核可包含但不限於CuInx Ga1-x Se2 、ZnInx Ga1-x Se2 、AgInx Ga1-x Se2 、CuInSe2-y Sy 、CuInx Ga1-x Se2-y Sy 、CuGaSe2-y Sy 、ZnInSe2-y Sy 、ZnGaSe2-y Sy 、AgInSe2-y Sy 及AgGaSe2-y Sy ，其中0≤x≤1；及0≤y≤2。在另一實施例中，該四元金屬硫族化物核可包含Zn而非Ga，包含但不限於具有式CuInZnS之核。在另一實施例中，奈米顆粒核102可係三元金屬硫族化物。三元金屬硫族化物核可包含但不限於CuInSe2 、CuGaSe2 、ZnInSe2 、ZnGaSe2 、AgInSe2及AgGaSe2 。
在一實施例中，奈米顆粒核102大體上被金屬硫族化物殼103包圍。在一實施例中，殼103可包含具有式Mx Ey 之二元金屬硫族化物，其中M係任何金屬及E係任何硫族元素。二元金屬硫族化物殼可包含但不限於Cux Sy 、Inx Sy 及Gax Sy ，其中0≤x≤2；及0≤y≤3。
在一實施例中，核殼奈米顆粒101包含由Cu、In、Ga及Se製成之核102(即，「CIGSe」核)。CIGSe核102可大體上被由CuS或InS製成的殼103包圍。
在一實施例中，上述之核殼奈米顆粒可用於製造PV電池吸收薄膜。圖2(僅藉由實例之方式)顯示具有衍生自核殼奈米顆粒之吸收層之示例性PV裝置200的層。該等示例性層沉積於載體201上。該等層係：基板層202(通常係鉬)、衍生自核殼奈米顆粒之吸收層203、硫化鎘層204、氧化鋁鋅層205及鋁接觸層206。熟習此項技術者將領會基於CIGS之PV裝置可包含比圖2中說明之更多或更少的層。
載體201可係任何類型之可支撐層202-206的剛性或半剛性材料。實例包含玻璃、矽及可捲式材料例如塑膠。基板層202係沉積於載體層201上以對PV裝置提供電接觸及促進基於核殼奈米顆粒之吸收層203對載體層之黏著。
吸收層203係衍生自上述之核殼奈米顆粒且可包含一或多個包括Cu、In及/或Ga、Se及/或S之層。該核殼奈米顆粒層可在整個層中具有統一的化學計量。或者，Cu、In及/或Ga、Se及/或S的化學計量可在整個吸收層203中變化。例如，在一實施例中，該吸收層可包含具有變化之鎵含量的層。根據一實施例，In對Ga之比率可作為該層內之深度的函數而變化。同樣地，Se對S之比率可在層內變化。在又一實施例中，基於核殼奈米顆粒之吸收層203可係p型半導體。因此可有利地在PV電池200內包含n型半導體204之層。合適之n型半導體之實例包含但不限於CdS。
頂部電極205可係透明導體，例如氧化銦錫(ITO)或氧化鋁鋅(AZO)。可藉由金屬接觸206提供與頂部電極205之接觸，金屬接觸206本質上可係任何金屬，包含但不限於鋁、鎳或其合金。
於基板上沉積CIGS層之方法係描述於2008年11月26日申請之且作為公開案第US2009/0139574號(本文指「'354申請案」)公開之美國專利申請案第12/324,354號中，該案之全部內容以引用之方式併入本文中。此等方法可用於沉積本文所述之核殼奈米顆粒。簡而言之，可藉由以下步驟在基板上形成CIGS層：在油墨組合物中分散CIGS型核殼奈米顆粒及使用該油墨組合物以在基板上形成膜。然後使該膜退火以產出CIGS材料層。圖3係說明使用CIGS型核殼奈米顆粒油墨在基板上形成CIGS材料層之示例性步驟的流程圖。首先(301)，使用技術例如印刷、噴塗、旋塗、刮刀塗佈或類似技術，將含有CIGS型核殼奈米顆粒之油墨在基板上塗覆一層膜。示例性油墨組合物描述於'354申請案中。
通常在塗覆步驟(301)之後實施一或多個退火/燒結步驟(302、303)。該(等)退火步驟可蒸發油墨之有機組分及其他有機物，例如存在於CIGS型奈米顆粒中的封蓋配位體。該(等)退火步驟亦熔化CIGS型奈米顆粒。或者或此外，沉積之油墨組合物可藉由與H2 發生還原反應而熔化，隨後用含有硒之氣體如H2 Se進行反應性燒結(305)。退火后，可使膜冷卻(304)以形成較佳由CIGS材料之晶體組成的CIGS層。可重複塗覆、退火及冷卻步驟(306)多次以在吸收層內形成多個層。每層可包含不同的化學計量。例如，可藉由改變用於每層之初始油墨組合物中之鎵濃度以形成具有不同鎵濃度之層 。
在一實施例中，用於上述油墨組合物之CIGS材料包含一或多種文中圖1所述之核殼奈米顆粒。例如，該油墨組合物包含一或多種奈米顆粒，該等奈米顆粒包含大體上由二元金屬硫族化物包圍的四元或三元金屬硫族化物核。
在一實施例中，CIGS層係衍生自不同類型之核殼奈米顆粒的摻合物。該等核殼奈米顆粒核可在退火/燒結步驟期間起到相互孤立/惰性的作用，而殼作為影響顆粒生長之反應性材料。談及圖4，僅藉由實例之方式，油墨組合物401可包含CuInGaSe/CuS核殼奈米顆粒402及CuInGaSe/InS核殼奈米顆粒403之摻合物。該油墨組合物係沉積404於PV電池接觸405上。然後將沉積之奈米顆粒暴露於熱及含硒氣體406以驅動奈米顆粒殼402、403之間之反應。結果係在PV電池接觸405頂部形成CIGS層407。在一實施例中，最終薄膜層407包含在CuInSSe基質409內之CuInGaSe晶體408。在一替代實施例中，該沉積之油墨組合物可包含具有CuInGaSe核之CuS、InS及GaS殼以形成具有大量CuInGaSe的CuInGaSSe基質。
本文中所揭示之發明比習知的CIGS奈米顆粒之固相沉積方法提供更多優勢。首先，奈米顆粒之殼組分將其核與表面分離。所以，在薄膜處理期間殼可阻止鎵反應及因此遷移。此可導致高鎵含量，高鎵含量影響較高帶隙材料且可導致增加VOC 。第二，本文揭示之核殼奈米顆粒包含二元金屬硫族化物殼。二元金屬硫族化物展現比四元或三元金屬硫族化物更優異的顆粒生長。較大顆粒生長導致電流(Jsc )增強。此外，二元金屬硫族化物僅係核殼奈米顆粒體積之一小部份。此種設計避免自二元金屬硫族化物形成含鎵材料中常見的顆粒生長控制問題。第三，在一個實施例中，該油墨組合物可包含相對於以In為主之殼過量的以Cu為主之殼及過量之負載In/Ga之核。此富銅之殼環境可在燒結期間最大化顆粒生長。另一方面，該等In/Ga核可最終導致缺銅之最終膜化學計量，從而滿足最佳電子需求。第四，在另一實施例中，該等核殼奈米顆粒之核可包含硒替代硫。此意味著不需要為體積膨脹而替換在大多數薄膜中的硫。預期若各顆粒之外部係使用S作為陰離子組成，則硒可替換硫，提供體積膨脹，其反應最易發生及其膨脹將最有益(在需要填充間隙及晶界熔融之表面)。由於使用Se作為陰離子組成核，所以不需要反應性氣體滲透深入顆粒內以替換深層的S以達成均勻性及維持所需之帶隙。此可允許較低濃度之Se試劑及/或較短處理時間及/或可能的較低處理溫度。因此，可實施不太苛刻之硒化製程，例如較低濃度之H2 Se或元素硒。
實例
實例1：核殼奈米顆粒之合成
此實例描述一種合成CIGSe/InS核殼奈米顆粒之方法。但是，可使用相同或相似之方法藉由合適之比例簡單取代初始材料來製造該等實施例所述之任何其他核殼奈米顆粒。例如，核初始材料CIGSe可由任何具有式AB1-x B'x C2-y C'y 之金屬硫族化物取代，其中A係Cu、Zn、Ag或Cd；B及B'獨立地係Al、In或Ga；C及C'獨立地係S、Se或Te；0≤x≤1；及0≤y≤2。此外，殼初始材料二乙基二硫胺基甲酸銦(III)可由任何具有式Mx Ey 之硫族化物取代。
在一實施例中，將2.68 g CIGSe核奈米顆粒添加至經烘箱乾燥之250 ml圓底燒瓶中及隨後配置Liebig冷凝器。用N2 徹底淨化燒瓶。向燒瓶中加入30 ml經脫氣之二芐醚及加熱該混合物至150°C。亦在N2 下向小瓶中加入0.978 g二乙基二硫胺基甲酸銦(III)、14 ml經脫氣之二芐醚及6 ml三辛基膦。隨後將所得小瓶懸浮液添加至CIGSe溶液中，及加熱該混合物至200°C，保持90分鐘。最後，讓該混合物冷卻至室溫。
冷卻後，將燒瓶開放至大氣壓及在2700 G下旋轉混合物五分鐘。收集上層清液作為備用及將剩餘之固體分散於25 ml甲苯中。在2700 G下旋轉該分散系五分鐘及然後將上層清液與分散系合併。進一步將任何剩餘之固體分散於15 ml甲苯中且在2700 G下旋轉該混合物五分鐘。再次合併上層清液與分散系及丟棄任何剩餘之殘餘物。向合併之上層清液中加入250 ml甲醇及在2700 G下旋轉該混合物五分鐘。丟棄無色之上層清液並從25 ml二氯甲烷/200 ml甲醇中再沉澱所得固體。離心分離出沉澱且在真空下乾燥該沉澱(產量：2.218 g)。
圖5(僅藉由實例之方式)比較無殼之CIGSe奈米顆粒的UV-Vis及光致發光光譜與CIGSe/InS核殼奈米顆粒的UV-Vis及光致發光光譜。在一實施例中，當CIGSe材料與二乙基二硫胺基甲酸銦(III)反應以形成InS殼時，峰值強度增加。當使用較高能帶隙材料作為殼以鈍化核奈米顆粒表面時，此係預期之結果。亦表明與單獨之奈米顆粒形成或將In及S摻入至既有CIGSe奈米顆粒中相反之殼形成。
圖6(僅藉由實例之方式)顯示無殼之CIGSe奈米顆粒之ICP/OES元素分析與CIGSe/InS核殼奈米顆粒之ICP/OES元素分析的比較。在一實施例中，結果顯示在核殼奈米顆粒中In及S之含量增加。
圖7(僅藉由實例之方式)顯示無殼之CIGS奈米顆粒之XRD分析與核殼CIGS/InS奈米顆粒之XRD分析的比較，及來自於粉末衍射標準聯合委員會(JCPDS)之數據庫之CIS及CGS奈米顆粒之參考圖案。在一實施例中，結果顯示在殼形成後無來自其他相或材料的額外峰發展，此表明存在與摻雜或單獨成核相反之殼。
先前提出使用本發明之原理之系統的具體實施例。即使本文未明確揭示，但熟習該項技術者可設計出使用此等原理且因此在本發明之範圍內之替代物及變型。儘管已顯示及描述本發明之特定實施例，但其等無意限制本發明專利範圍。熟習該項技術者將瞭解可在不脫離藉由下述申請專利範圍照字義且等效地涵蓋之本發明的範圍的情況下做出各種變化及修改。
101‧‧‧核殼奈米顆粒
102‧‧‧核
103‧‧‧金屬硫族化物殼
200‧‧‧示例性PV裝置
201‧‧‧載體
202‧‧‧基板層
203‧‧‧衍生自核殼奈米顆粒之吸收層
204‧‧‧硫化鎘層
205‧‧‧氧化鋁鋅層
206‧‧‧鋁接觸層
301‧‧‧塗覆
302‧‧‧退火/燒結步驟
303‧‧‧退火/燒結步驟
304‧‧‧冷卻
305‧‧‧反應性燒結(硒化)
401‧‧‧油墨組合物
402‧‧‧CuInGaSe/CuS核殼奈米顆粒
403‧‧‧CuInGaSe/InS核殼奈米顆粒
404‧‧‧沉積
405‧‧‧PV電池接觸
406‧‧‧熱/含硒氣體
407‧‧‧CIGS層
408‧‧‧CuInGaSe晶體
409‧‧‧CuInSSe基質
當結合附圖閱讀時，可更好地理解前述之發明內容，及下述之實施方式。圖式中所示之某些實施例僅用於說明之目的。但是，應瞭解，本文所揭示之發明概念不限於該等圖式所示之明確的配置及工具。
圖1係根據本發明之一實施例之核殼奈米顆粒的示意性橫截面圖。
圖2顯示根據本發明之一實施例之光伏打裝置之層。
圖3係根據本發明之一實施例之包括使用CIGS型奈米顆粒油墨在基板上形成CIGS材料層之示例性步驟的流程圖。
圖4顯示根據本發明之一實施例之加熱及硒化核殼奈米顆粒組合物以形成CIGS薄膜。
圖5係根據本發明之一實施例之無殼之CIGS奈米顆粒與CIGS/InS核殼奈米顆粒之UV-Vis光譜及光致發光光譜的比較。
圖6顯示根據本發明之一實施例之無殼之CIGS奈米顆粒與CIGS/InS核殼奈米顆粒的ICP/OES元素分析。
圖7顯示本發明之一實施例之核殼CIGS/InS奈米顆粒之XRD分析與無殼之CIGS奈米顆粒之XRD分析的比較。

Claims (14)

  1. 一種物質之組合物，該組合物包含： 基質，其具有Cu、In及Ga之一種或多種，及S及Se之一種或多種；及 複數個核奈米顆粒，分散於該基質，該等核奈米顆粒包含具有式AB1-x B'x C2-y C'y 的金屬硫族化物， 其中A係Cu、Zn、Ag或Cd； B及B'係Al、In或Ga； C及C'係S、Se或Te； 0≤x≤1； 0≤y≤2； B及B'非相同元素；及 C及C'非相同元素。
  2. 如請求項1之組合物，其中該基質包含CuInSSe及CuInGaSSe之任一者。
  3. 如請求項1之組合物，其中該複數個核奈米顆粒為CuIn1-x Gax S2-y Sey 。
  4. 如請求項1之組合物，其中該複數個核奈米顆粒為CuInGaSe核奈米顆粒。
  5. 一種在具有基板之光伏打裝置內形成吸收層之方法，其包括： 塗覆油墨薄膜於該基板上，該油墨包含複數個CIGS型核殼奈米顆粒，每一CIGS型核殼奈米顆粒包括：具有式AB1-x B'x C2-y C'y 的核， 其中A係Cu、Zn、Ag或Cd；B及B'係Al、In或Ga；C及C'係S、Se或Te；0≤x≤1；0≤y≤2；B及B'非相同元素；及C及C'非相同元素；及 殼，其實質上包圍著該核，該殼包括具有式Mx Ey 的二元金屬硫族化物，其中M係金屬及E係硫族元素；及 加熱該經塗覆之基板以使該等CIGS型核殼奈米顆粒之殼反應及形成具有該等CIGS型核殼奈米顆粒之核分散於其中之基質。
  6. 如請求項5之方法，其進一步包括在含硒氣體的存在下加熱該經塗覆基板。
  7. 如請求項5之方法，其中該等CIGS型核殼奈米顆粒之殼包含Cu、In及Ga之一種或多種，及S及Se之一種或多種。
  8. 如請求項5之方法，其中該等CIGS型核殼奈米顆粒之核為CuIn1-x Gax S2-y Sey 核。
  9. 如請求項5之方法，其中該等CIGS型核殼奈米顆粒之核為CuInGaSe核。
  10. 如請求項5之方法，其中該等CIGS型核殼奈米顆粒包含CuInGaSe/CuS核殼奈米顆粒及CuInGaSe/InS核殼奈米顆粒。
  11. 如請求項5之方法，其中該基質包含CuInSSe及CuInGaSSe之任一者。
  12. 一種核殼奈米顆粒，其包括： 核，其中該核包括具有式AB1-x B'x C2-y C'y 之金屬硫族化物，其中A係Cu、Zn、Ag或Cd；B及B'獨立地係Al、In或Ga；C及C'獨立地係S、Se或Te；0≤x≤1；及0≤y≤2；及 包圍著該核之殼，該殼包括具有式Mx Ey 之二元金屬硫族化物，其中M係選自週期表中第11族或第13族之金屬及E係硫族元素。
  13. 複數種核殼奈米顆粒，每一核殼奈米顆粒具有一或多個選自以下組成之群之核：CuInSe2 、CuInx Ga1-x Se2 、CuGaSe2 、ZnInSe2 、ZnInx Ga1-x Se2 、ZnGaSe2 、AgInSe2 、AgInx Ga1-x Se2 、AgGaSe2 、CuInSe2-y Sy 、CuInx Ga1-x Se2-y Sy 、CuGaSe2-y Sy 、ZnInSe2-y Sy 、ZnInx Ga1-x Se2-y Sy 、ZnGaSe2-y Sy 、AgInSe2-y Sy 、AgInx Ga1-x Se2-y Sy 及AgGaSe2-y Sy ，其中0≤x≤1；及0≤y≤2， 其中該一種或多種核係包於二元金屬硫族化物殼中，該二元金屬硫族化物殼係選自由Cux Sy 、Inx Sy 及Gax Sy 組成之群，其中0≤x≤2；及0≤y≤3。
  14. 一種核殼奈米顆粒，該核殼奈米顆粒包括： 核，其包括Cu、In、Ga及Se；及 殼，其包括CuS或InS。
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